Anti-impact and high-weather-resistant PVC water supply and drainage pipe and butt joint installation method

Abstract

The invention relates to an anti-impact and high-weather-resistant PVC water supply and drainage pipe and a butt joint installation method, the anti-impact and high-weather-resistant PVC water supply and drainage pipe comprises an inner hard PVC material layer and an outer soft PVC material layer, and the hard PVC material layer and the soft PVC material layer are co-extruded to form the PVC water supply and drainage pipe. The soft PVC material layer and the hard PVC material layer which are the same as the PVC base material are finally selected to be combined through screening testing, due to the fact that the soft PVC material layer and the hard PVC material layer are both PVC base materials and do not need an adhesive layer, the two-layer structure can form a good bonding effect through co-extrusion, the bonding problem is solved, the problems of cracking and the like caused by the fact that conventional exterior decoration materials ASA, PMMA and the like are adopted in the market to be combined with the hard PVC are solved, and the service life of the PVC base material is prolonged. The impact resistance and the high weather resistance are improved. Due to the fact that the inner structure of the soft PVC material layer on the outer layer is provided with a large number of micropore channel gaps, the pipe has a good noise reduction function. The structure of the inner wall of the hard PVC material layer of the inner layer is not changed, so that relatively simple and convenient butt joint installation between the pipes can be realized in a manner of embedding and bonding the inner-layer pipe fitting between the pipes.

Description

Technical Field

[0001] The invention relates to the technical field of drainage pipes, and in particular to an impact-resistant and highly weather-resistant PVC water supply and drainage pipe and a butt-joint installation method. Background Art

[0002] PVC water supply and drainage pipes are substitutes for traditional water supply and drainage pipes, and have good physical and chemical properties. The inner wall of PVC water supply and drainage pipes is smooth, and the friction resistance is smaller than that of conventional pipes. Therefore, the slope of the horizontal pipe installation is small, which can increase the indoor net height of the building. At the same time, it is light, about one-fifth of the cast iron pipe, easy to transport and operate, and uses adhesive connection, which is convenient for installation and maintenance; the price is lower than that of conventional pipes, which greatly reduces the project cost; it has strong corrosion resistance and is widely used in building sewage and rainwater pipe systems.

[0003] The shortcomings of existing products are poor impact resistance and easy penetration by debris carried by water flow; the surface is easily worn during transportation and has poor weather resistance, so they cannot be used in exposed environments, which greatly reduces the application scenarios of the products. Summary of the invention

[0004] 1. Technical issues to be resolved

[0005] In order to solve the above problems in the prior art, the present invention provides an impact-resistant and highly weather-resistant PVC water supply and drainage pipe and a docking installation method, which can improve the impact-resistant and highly weather-resistant performance.

[0006] (II) Technical solution

[0007] In order to achieve the above-mentioned purpose, a technical solution adopted by the present invention is: an impact-resistant and highly weather-resistant PVC water supply and drainage pipe, comprising an inner hard PVC material layer and an outer soft PVC material layer, wherein the hard PVC material layer and the soft PVC material layer are co-extruded to form the PVC water supply and drainage pipe.

[0008] Another technical solution adopted by the present invention is: a method for butt-jointing and installing impact-resistant and highly weather-resistant PVC water supply and drainage pipes, wherein the two ends of the inner layer pipe fittings are respectively embedded and bonded into the pipe openings of the PVC water supply and drainage pipes on both sides that need to be butt-jointed and installed, and the pipe openings of the PVC water supply and drainage pipes on both sides are closed and aligned to complete the butt-joint installation.

[0009] (III) Beneficial effects

[0010] The beneficial effects of the present invention are:

[0011] ① By combining the inner hard PVC material layer and the outer soft PVC material layer, the pipe has good impact resistance and high weather resistance, and the double-layer structure has good thermal insulation performance. One of the very important technical difficulties of the present invention is: it must be ensured that the co-extruded pipe layers must have good bonding strength without poor bonding; in order to solve the bonding problem, we finally selected the soft PVC material layer with the same PVC substrate to be combined with the hard PVC material layer through screening and testing. Since they are all PVC base materials, no adhesive layer is required. The two-layer structure can form a good bonding effect through co-extrusion. This not only solves the bonding problem, but also avoids the problems of cracking due to shrinkage differences caused by the combination of conventional exterior materials ASA, PMMA and hard PVC on the market, thereby improving the impact resistance and high weather resistance. In addition, since the internal structure of the outer soft PVC material layer has more microporous channel gaps, the pipe has a good sound-absorbing function, and the sound will be transmitted and weakened in the microporous channel gaps, and eventually disappear.

[0012] ② Due to the multi-layer structure of the existing multi-layer pipe, the shape of the inner wall of the pipe generally changes. Therefore, the butt-jointing installation between two pipes requires a more complicated installation method, such as locking screws. However, since the inner wall structure of the inner hard PVC material layer does not change, the inner layer pipe fittings can be embedded and bonded between the pipes that need to be butt-jointed, thereby achieving a relatively simple butt-jointing installation between the pipes, thereby increasing the scope of use of this product. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a cross-sectional view of an impact-resistant and highly weather-resistant PVC water supply and drainage pipe of the present invention;

[0014] Figure 2 It is a structural schematic diagram of a specific docking process of a method for docking and installing an impact-resistant and highly weather-resistant PVC water supply and drainage pipe of the present invention;

[0015] Figure 3 It is a plan view schematically showing a specific docking process of a method for docking and installing an impact-resistant and highly weather-resistant PVC water supply and drainage pipe of the present invention;

[0016] [Description of Reference Numerals]

[0017] 1. Hard PVC material layer; 2. Soft PVC material layer; 3. PVC water supply and drainage pipes; 4. Inner pipe fittings. DETAILED DESCRIPTION

[0018] In order to better explain the present invention and facilitate understanding, the present invention is described in detail below through specific implementation modes in conjunction with the accompanying drawings.

[0019] Please refer to Figure 1As shown, an impact-resistant and highly weather-resistant PVC water supply and drainage pipe comprises an inner hard PVC material layer and an outer soft PVC material layer, wherein the hard PVC material layer and the soft PVC material layer are co-extruded to form the PVC water supply and drainage pipe.

[0020] Another technical solution adopted by the present invention is: a method for butt-jointing and installing impact-resistant and highly weather-resistant PVC water supply and drainage pipes, wherein the two ends of the inner layer pipe fittings are respectively embedded and bonded into the pipe openings of the PVC water supply and drainage pipes on both sides that need to be butt-jointed and installed, and the pipe openings of the PVC water supply and drainage pipes on both sides are closed and aligned to complete the butt-joint installation.

[0021] From the above description, it can be seen that the beneficial effect of the present invention is that one of the important technical difficulties of the present invention is that it is necessary to ensure that the co-extruded tube layers have good adhesion to each other without poor adhesion. In order to solve the bonding problem, we finally select the soft PVC material layer with the same PVC substrate and the hard PVC material layer through screening and testing. Since they are all PVC base materials, no adhesive layer is required. The two-layer structure can form a good bonding effect through co-extrusion. This not only solves the bonding problem, but also avoids the problems of cracking due to shrinkage differences caused by the combination of conventional exterior materials ASA, PMMA, etc. and hard PVC on the market, thereby improving the impact resistance and high weather resistance. In addition, since the internal structure of the outer soft PVC material layer has more microporous channel gaps, the pipe has a good sound-absorbing function, and the sound will be transmitted and weakened in the microporous channel gaps and eventually disappear.

[0022] Furthermore, the hardness of the soft PVC material layer is greater than or equal to 75HA.

[0023] From the above description, it can be seen that after testing, the soft PVC material layer with a hardness greater than or equal to 75HA not only has the characteristics of soft PVC material, but also has a wider range of thickness that can be produced within this hardness range, and the thickness of the soft PVC material layer can be made according to specific application requirements. If it is less than 75HA, the product thickness is limited, and the thickness of the soft PVC material layer can only be increased to meet the reliability requirements.

[0024] Please refer to Figure 2 and Figure 3 As shown, a method for butt-jointing and installing impact-resistant and highly weather-resistant PVC water supply and drainage pipes is provided, wherein the two ends of the inner pipe fittings are respectively embedded and bonded into the pipe openings of the PVC water supply and drainage pipes on both sides that need to be butt-jointed and installed, and the pipe openings of the PVC water supply and drainage pipes on both sides are closed and aligned to complete the butt-joint installation.

[0025] From the above description, it can be seen that the beneficial effect of the present invention is that: due to the multi-layer structure of the existing multi-layer pipe, the shape of the inner wall of the pipe generally changes, so the butt-joint installation between two pipes requires a more complicated installation method, such as by locking screws, etc., while in the present invention, since the inner wall structure of the inner hard PVC material layer does not change, the inner layer pipe fittings can be embedded and bonded between the pipes that need to be butt-jointed, thereby achieving a relatively simple butt-joint installation between the pipes.

[0026] Embodiment 1

[0027] Please refer to Figure 1 As shown, an impact-resistant and highly weather-resistant PVC water supply and drainage pipe comprises an inner hard PVC material layer 1 and an outer soft PVC material layer 2, wherein the hard PVC material layer 1 and the soft PVC material layer 2 are co-extruded.

[0028] The hardness of the soft PVC material layer 2 is greater than or equal to 75HA.

[0029] The outer layer soft PVC material preparation scheme of the present invention comprises: PVC material powder (type 5), filler (light calcium), calcium zinc stabilizer, lubricant, plasticizer, pigment, antioxidant, impact modifier, AC foaming agent and other additives.

[0030] The preparation process and technology of the outer soft PVC material of the present invention:

[0031] ①Formula setting → Raw material mixing → Hot mixing → Cold mixing → Heating extrusion → Cooling molding → Granulation → Product

[0032] ② Each portion of base powder is stirred at high speed to 120°C, and then the base powder is cooled to 45°C; the cooled base powder is then plasticized into a viscous flow state under the high temperature and high pressure melting action of the extruder, and then extruded for wire drawing; cooling and granulation, the flow rate of cooling water is in the range of 8-12t / h, and the temperature of cooling water is in the range of 0-10°C. The granulator is a conical twin-screw extruder, and the barrel temperature is 5 zones, and the barrel temperature is distributed from low to high, specifically: 155°C in zone 1, 165°C in zone 2, 170°C in zone 3, 185°C in zone 4, 180°C in zone 5, the feed speed is 6-10r / min, the main machine current is 40-48A, and the melt pressure is 10-15MPa.

[0033] Among them, the soft PVC material layer 2 with anti-aging effect is used to enhance the aging effect and improve the impact resistance. At the same time, the soft PVC material layer (hardness ≥ 75HA) also has a sound-absorbing function. The sound is weakened in the microporous channel gap and eventually disappears. The hard PVC material layer 1 can realize the water supply and drainage functions on the one hand, and on the other hand, the conventional inner layer bonding solution can be realized through the inner hard PVC material layer 1, so as not to affect the installation.

[0034] After the co-extruded aging-resistant and impact-resistant PVC pipe double-layer material screening experiment, the test results are shown in the following table:

[0035] Co-extruded aging-resistant and impact-resistant PVC pipe double-layer material screening experiment

[0036]

[0037] In the above table, the outer material refers to the outer tube material, and the base material refers to the inner tube material. It can be seen from the above table that only when the outer tube material is soft PVC and the inner tube material is hard PVC, the aging effect of the outer tube can meet the requirements, and it can be fully bonded during co-extrusion at room temperature. The bonding effect after high and low temperature cycles is more than 95%. After the double-layer material screening of PVC pipes, the overall performance reaches the best effect.

[0038] Embodiment 2

[0039] Please refer to Figure 2 and Figure 3 , a method for butt-jointing and installing impact-proof and highly weather-resistant PVC water supply and drainage pipes, wherein the two ends of the inner pipe fitting 4 are respectively embedded and bonded (can be bonded by ordinary glue) into the pipe openings of the PVC water supply and drainage pipes 3 on both sides that need to be butt-jointed and installed, and the pipe openings of the PVC water supply and drainage pipes 3 on both sides are closed and aligned to complete the butt-jointing and installing. The shape of the inner wall of the existing multi-layer pipe generally changes due to its multi-layer structure, so the butt-jointing and installing between the two pipes requires a more complicated installation method, such as by locking screws, etc., while the inner wall structure of the inner hard PVC material layer of the present invention does not change, so the inner pipe fitting 4 can be embedded and bonded between the pipes that need to be butt-jointed, so as to achieve a relatively simple butt-jointing and installing between the pipes.

[0040] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's specification and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An impact-resistant and highly weather-resistant PVC water supply and drainage pipe, characterized in that: It comprises an inner hard PVC material layer and an outer soft PVC material layer, and the hard PVC material layer and the soft PVC material layer are co-extruded to form a PVC water supply and drainage pipe.

2. A method for butt-jointing and installing the impact-resistant and highly weather-resistant PVC water supply and drainage pipe according to claim 1, characterized in that: The two ends of the inner pipe fittings are respectively embedded and bonded into the pipe openings of the PVC water supply and drainage pipes on both sides that need to be butt-jointed and installed, and the pipe openings of the PVC water supply and drainage pipes on both sides are closed and aligned to complete the butt-joint installation.

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